Method of manufacturing pump assemblies



Sept. 19, 1.944. w. P. HILL METHOD OF MANUFACTURING PUMP ASSEMBLIES Filed Nov. 10, 1941 2 Sheets-Sheet 1 INWJVTOR.v

' WALTER P. HILL E ATTORNEZX; a

Sept. 19, 1944. w. P. HILL- Y METHOD 0F MNUFAGTURING PUMP AssEMBLIEs Filed Nov. 10, 1941 V22 Sheets-Sheet 2 F-IG.4.*

INVENTOR. v

y ATTORNEYS L L H P. R E A W Patented Sept. 19, 1944 UNITED STATES PATENT OFFICE Y i 2,358,711 f vf?, METHOD oF-MANUFAofr-UMNG PUMP f ASSEMBLIES W i Walter P. Hill, Detroit, Michi,r assignor,bymcsnev assignments, to {C'alumet and H ecla Conf soldated Copper Company, "Calumet, Mich., a

corporation of Michigan Application November 10, i941, serial No. 418,601

(o1. 23e-15er), o

2 Claims. This invention relatesto a method of manulfacturing a pump assembly of the" type wherein -the pump cylinder is housed in a casing containingtheuid tobe discharged and also refers to fan"k improved method' of manufacturing pump assemblies of this type. f Y

Oneofthe principal objects of this invention is to provide a pump assembly having a casing formed from a length of seamless tubing whereby the necessity for joints is reduced to a mini mum, and' wherein the pump mechanism may be readily housed and the entire device assembled quiclrly, ,economically and with a .ber of parts and operations.

" In Vaccordance'with"this invention I providea "casing formed from a length of seamless tubing fandhaving the oppositee'nds reduced to confine the pump cylinder in the casing and to Aform restricte'dlpeningsat each end of the casing for respectively receiving a packing means for the pump operating plunger anda discharge fitting orY nipple.

Another object ofthis invention is to vprovider a pump assembly ofthetype set forth above Ahaving a discharg'etube provided at one end with a fitting. or nipple andY having aV coupling secured tozthe pump casing for removably conmeeting the fitting or nipple to the casing whereby the discharge tube may be readily removed :Whenever it is desiredrto clean or repair the .same Also the` casing may be filled with the desired. fluid by merely removing .the nipple and associated discharge tube; .An' added advantage of `thi's"co`nstruction is that it eliminates the necessity of providing a separate fillerV opening in the casing with its resultant joint and thereby simplifies the manufacture, and reduces the cost of the construction.

In addition to the foregoing,Y the present invention contemplates an improved method of manufacturing pump assemblies of the type set zforthabove. InV accordance with this invention,

a llength of tubular stock is reduced at one end and a pump assembly is inserted intothe casing through the opposite end. The pump plunger isextended through the reduced end and a packing glandfor seal is suitably secured to the reduced end. The said opposite end of the casing v is then reduced and a threaded coupling is secured thereto. A discharge tube is extended into the pump through the coupling and a nipple at the end ofi-,his tube is threaded in the coupling.

Thefore'going, aswell as other objects, will be made more vapparent; as this description proceeds,

minimum num# operation andthe vopening B accommodates the Figure l is a sectional view of a vpum v l lbly constructed infaccor'dance with this inven- 'the accompanying drawings,'wlierein:

p assenttion; y 1

Figure 2 is a View similar tojFigure 1 showing the pumpV assembly as .it lappears' when', partially completed; A f

[Figure 3 is a top plan 'view showing one step in themethod of manufacturing the' pump assembly; i l,

Figure 4 is a sectional view 'taken on theline lll-AofliigureS;and.

Figure 5 is a cross sectional view taken on the line 5-'-5 of Figure 4.Y y Y n For the purpose of illustrating this invention I have selected a Vfire .extinguisheroffthe type embodying a casing adapted to contain the fluid and havinga plunger operated pump supported in'the :casing for dischargingthe,fluidffrom the casing. It is to be understood, however, that this invention is not limited to rerextinguishers .andmayrbe employed to'advantage'in manufacturing any pumpkassembly whereinthe pump cylinderis housed in a casing. v yWith the above inviewreference will now be made to the drawingsV wherein itr will benoted that the` reference characterV I0 'indicates 4gen'f erally ,a'pump assembly comprising a casing II' and a plunger operated double actingr pump I2 having 'a .cylinder I3. housed in the-casing II. The casing is adapted to be filled with a suitable lessv tubing-andV is reduced at opposite yends-to confinefthepump cylinder I3 therein. In reducingY the .opposite ends ofthe casing, restricted openings A and B are formed at opposite ends of the casing. The opening A enables the pump plunger to be extended through'the casing for fluid discharge fitting to be more 'fully hereinafter referred to., The above construction of casing .lends itself toeconornical manufacture be cause it obviates the necessity of providing sep- Larate closures for either or both ends of the cas--l ing and otherwise reduces the number yof joints, parts V`and operations to aminimum. By'eliminating joints or seams in the casing, leakage. is

preventedand this is especially advantageousin cases where the assembly is stored for longqpef riods Withud therein.

Y The specific pumpzshownfhereinforms vnofvpart Y Qf-this inventionand mayQbeIOf any;standard .or

fluid and .the pump lI2 discharges this'fluid from desired design. In the form illustrated herein the pump comprises the cylinder I3 and a piston I 4 reciprocably mounted in the cylinder. The piston is secured to a plunger I5 inthe form of a tube which extends through the upper end of the cylinder.. and through the corresponding end of the casing. Y A suitable packing meansV I6 is secured to the top of the casing for slidably receiving the plunger I5 and prevents escape of fluid through the upper end of the casing. A second seal I 'I is arranged to have a wiping engagement'with the plunger at a point immediately below the seal I6 and cooperates with the latter to 'reduce fluid leaks to a minimum.

The piston plunger I5 is operated by a handle I8 secured to the upper end of the plunger and r adapted to be locked when the pump is not in use by rotating the same relative to the plunger to engage the lugs I9 on the lower end of the handle shank with the lugs xed to the top of the casing. When the handle I8 is locked in place, as shown in Figure 2, fluid is prevented from escaping past the gland IS'by a spring pressed Hseal 2l housed in the shank of the handle.

A discharge tube 22 extends through the plung- K er tube I5 and is secured at its lower end to a fitting or nipple 23 which, in turn, is secured to the lower end of the casing I I. The upper end of cylinder fluid enters the plunger tube I5 and flows into the discharge tube 22 through the open upper end thereof. It may be pointed out at this time that iiuid is supplied to the cylinder I3 above the piston I4 as the latter is moved downwardly by a by-pass tube 29. The valveV arrangement rendering the above operationv possible is not shown herein and is preferably identical to the pumps employed in plunger operated re extinguishers.

In manufacturing the pump assembly previously described, a length of tubular stock, preferably seamless tubing, having the dimensions necessary to form the casing I I is substantially reduced at one end to provide the restricted opening A at the latter end. Particularly satisfactory results are obtained by reducing the end of the tubular stock with the reducing tool shown and described in my copending application, Serial #366,757, filed November 22, 1940. Briey described, this tool comprises a female die having a cavity 3|' therein corresponding in shape to the contour it is desired to impart to the end of the length of tuv bular stock and having a portion 32 of the form'- v'the discharge tube 22 is closed in the locked position of the handle I8 by a spring pressed valve 24 slidably mounted in therplunger and engageable with an annular shoulder 25 on the plunger tube during operation of the pump. This construction prevents fluid in the pump plunger` from entering the discharge is not ruse In accordance with this invention the discharge fitting orV nipple 23 is vremovably secured to the lowerend of the casing I I by a coupling 26 suitably secured in the opening B in the bottom of the casing and internally threaded for engagement with theexternal threads on the nipple 23.v` It is important to note at this time that theV tube when the device above construction enables the casing Il to be lled with fluid through the coupling 26 by merely removing the nipple 23. As a result, the ,ller opening and .associated closure, heretofore, required in pump assemblies of the type referred to, may be eliminated. Moreover, since the dischargertube 22 is removable with thernipple 23, it follows that this tube may be'readily detached Yfrom the assembly for cleaning or repair purposes, when desired. The nipple 23"is provided with a projection 28 forming a seat for the lower end of the pump. y

' The operation of the pump l2 is well understood by those skilled in this art and a detailed description of the same is not required for an understanding of this invention. It will suice to point out that the pump of thev double acting typeso c thatfluidis discharged from the casing II through thedischargejtube 22 and nipple 23 when the plunger I5 is moved in both directions. In general, when the piston I4 on the plunger is moved Y in an upward direction, the fluid above the piston V movement of the piston and, at the same time,

fluid isdrawn into the pump cylinder ,I3 below the piston I4. The plungertube I5 is also provided with an opening below the piston III-so that whenE the latter is moved downwardly in` the ing surface relieved. The length of tubular stock and the reducing tool are relatively moved toward each other to extend the end of the stock to be reduced into the cavity and' apply an endwise pressure onY the stock. At the same time the stock and reducing tool are relatively rotated and the stock is thoroughly worked by one or both edges of the relief portion 32. As pointed out in detail in the above identified application, the relief portion 32 extends for substantially the full Vlength of the workingface of the die and relieves confinement of the stock for a sufficient portion of its circumference to permit distortion of a portion of the stock during the reducing operation. This feature is important because it enables a relatively large reduction of the end of the stock without the danger of folding, tearing or otherwise harming the stock. Y Y

After the upper end of the stock is reduced, the seal VI 6 is inserted into the opening A and is suitably secured in place. The pumpV I2 is then assembled in the casing II by inserting the pump Y as a unit into the stock through the lower end. The plunger tube I5 is extended through the s'eal IB and the handle assembly I8 is secured to the projecting end of the plunger. Upon Completion of the above operation, the lower end of the stock isV reduced in thesame manner as the upper end to form the casing II and to confine the pump cylinder I3' in the casing.

As a result ofV reducing the lower end Vof the stock, the restricted opening B is formed and the coupling 26 is suitably secured in this opening. The casing I I is then lled with the fluid through the opening in the coupling andk the discharge tube Y22 is secured in place by threading the nipple 23 in the coupling. Y

Inasmuch as the Vlength of tubular stock is inthe form of ,seamless tubing, it follows that the casing resulting Yfrom the above'method of manufacture is both seamless and jointless. This is desirable notY only fromthe standpoint ofrefcient and' economical manufacture but also because 4it reduces any tendency for leaks to develop to a minimum. Y Also, with the above construction the discharge tubemay be readily removedn for cleaningljor repair purposes and the casing may be niiedwith the desired fluid through the coupling, thusfobviating'the necessityof providing` a special filler opening.

' ducing the said opposite end of the stock beyond the adjacent end of the pump cylinder to form the Icasing and to confine the pump cylinder in the casing.

2. The method of manufacturing a pump assembly having a. pump including a cylinder enclosed in a seamless and jointless casing having the opposite ends reducedY to a diameter substantially less than the outside diameter of the pump cylinder, comprising the steps of reducing one end of a length of tubular stock by exerting a reducing pressure by rotating means on a continuous area extending over a major portion of the circumference of the stock While leaving the remaining portion free to deform in response to 10 the reducing pressure, inserting the pump cylinder into the stock through the opposite end of `the latter, and `similarly reducing the said opposite end of the stock beyond the adjacent end of the pump cylinder to form said casing and to'conflne 15 the pump cylinder in the casing.

WALTER P. HILL. 

